CA1039873A - Amplifier circuit for increasing transmit and receive levels - Google Patents
Amplifier circuit for increasing transmit and receive levelsInfo
- Publication number
- CA1039873A CA1039873A CA254,087A CA254087A CA1039873A CA 1039873 A CA1039873 A CA 1039873A CA 254087 A CA254087 A CA 254087A CA 1039873 A CA1039873 A CA 1039873A
- Authority
- CA
- Canada
- Prior art keywords
- amplifier
- transmit
- receive
- port
- transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
- Control Of Amplification And Gain Control (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US05/591,956 US3963876A (en) | 1975-06-30 | 1975-06-30 | Amplifier circuit for increasing transmit and receive levels in a telephone hybrid network |
Publications (1)
Publication Number | Publication Date |
---|---|
CA1039873A true CA1039873A (en) | 1978-10-03 |
Family
ID=24368655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA254,087A Expired CA1039873A (en) | 1975-06-30 | 1976-06-04 | Amplifier circuit for increasing transmit and receive levels |
Country Status (13)
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1056970A (en) * | 1977-01-10 | 1979-06-19 | Northern Telecom Limited | Electronic network for telephone set |
US4178484A (en) * | 1977-06-27 | 1979-12-11 | Vincent Ogden W | Long line telephone system with an amplifying substation |
US4112262A (en) * | 1977-07-26 | 1978-09-05 | Bell Telephone Laboratories, Incorporated | Telephone station repeater |
US4268723A (en) * | 1979-09-04 | 1981-05-19 | Western Electric Company | Circuits and methods for initializing the loop current of a telephone set |
FR2481550B1 (fr) * | 1980-04-25 | 1985-08-02 | Trt Telecom Radio Electr | Dispositif de protection contre l'effet larsen dans un poste telephonique a haut-parleur |
KR820001673B1 (ko) * | 1981-03-18 | 1982-09-15 | 금성통신 주식회사 | 음성 스위칭 회로 |
USRE33309E (en) * | 1981-06-15 | 1990-08-21 | Walker Equipment Corporation | Telephone handset amplifier circuit |
US4466120A (en) * | 1981-06-15 | 1984-08-14 | Walker Equipment Corporation | Telephone handset amplifier circuit |
US4588859A (en) * | 1983-08-02 | 1986-05-13 | Zvie Liberman | Two channel audio communication system |
US4577310A (en) * | 1984-05-16 | 1986-03-18 | Tie/Communications, Inc. | Station interface for digital electronic telephone switching system having centralized digital audio processor |
JPS6195151U (US06265458-20010724-C00056.png) * | 1984-11-27 | 1986-06-19 | ||
AU645860B2 (en) * | 1990-12-18 | 1994-01-27 | Alcatel Australia Limited | Method of automatically adjusting side-tone in a telephone subset |
US6125630A (en) * | 1995-10-27 | 2000-10-03 | Tuff Torq Corporation | Axle driving apparatus |
US5920846A (en) * | 1996-02-27 | 1999-07-06 | Southwestern Bell Telephone Co. | Method and system for processing a service request relating to installation, maintenance or repair of telecommunications services provided to a customer premises |
US6993125B2 (en) * | 2003-03-06 | 2006-01-31 | Avaya Technology Corp. | Variable sidetone system for reducing amplitude induced distortion |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE759917A (fr) * | 1969-12-08 | 1971-05-17 | Western Electric Co | Reseau a frequence acoustique |
US3751602A (en) * | 1971-08-13 | 1973-08-07 | Bell Telephone Labor Inc | Loudspeaking telephone |
US3823273A (en) * | 1971-12-17 | 1974-07-09 | Gte Automatic Electric Lab Inc | Subscriber's telephone circuit |
GB1406663A (en) * | 1972-08-22 | 1975-09-17 | Standard Telephones Cables Ltd | Telphone subset circuits |
US3889059A (en) * | 1973-03-26 | 1975-06-10 | Northern Electric Co | Loudspeaking communication terminal apparatus and method of operation |
-
1975
- 1975-06-30 US US05/591,956 patent/US3963876A/en not_active Expired - Lifetime
-
1976
- 1976-06-04 CA CA254,087A patent/CA1039873A/en not_active Expired
- 1976-06-24 AU AU15262/76A patent/AU497007B2/en not_active Expired
- 1976-06-24 FR FR7619249A patent/FR2316811A1/fr not_active Withdrawn
- 1976-06-25 BE BE168323A patent/BE843421A/xx unknown
- 1976-06-28 IL IL49923A patent/IL49923A0/xx unknown
- 1976-06-28 SE SE7607374A patent/SE7607374L/xx unknown
- 1976-06-28 IT IT24806/76A patent/IT1063840B/it active
- 1976-06-29 DE DE19762629033 patent/DE2629033A1/de active Pending
- 1976-06-29 NL NL7607118A patent/NL7607118A/xx not_active Application Discontinuation
- 1976-06-30 JP JP51076619A patent/JPS526004A/ja active Pending
- 1976-06-30 CH CH836176A patent/CH607486A5/xx not_active IP Right Cessation
- 1976-06-30 ES ES449356A patent/ES449356A1/es not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IL49923A0 (en) | 1976-08-31 |
SE7607374L (sv) | 1976-12-31 |
JPS526004A (en) | 1977-01-18 |
ES449356A1 (es) | 1977-07-16 |
US3963876A (en) | 1976-06-15 |
AU497007B2 (en) | 1978-11-16 |
BE843421A (fr) | 1976-10-18 |
CH607486A5 (US06265458-20010724-C00056.png) | 1978-12-29 |
DE2629033A1 (de) | 1977-01-27 |
NL7607118A (nl) | 1977-01-03 |
FR2316811A1 (fr) | 1977-01-28 |
IT1063840B (it) | 1985-02-18 |
AU1526276A (en) | 1978-01-05 |
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